122439250981 has 2 divisors, whose sum is σ = 122439250982. Its totient is φ = 122439250980.

The previous prime is 122439250961. The next prime is 122439250993. The reversal of 122439250981 is 189052934221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105800572900 + 16638678081 = 325270^2 + 128991^2 .

It is an emirp because it is prime and its reverse (189052934221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 122439250981 - 2¹¹ = 122439248933 is a prime.

It is a super-2 number, since 2×122439250981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122439250931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61219625490 + 61219625491.

It is an arithmetic number, because the mean of its divisors is an integer number (61219625491).

Almost surely, 2^122439250981 is an apocalyptic number.

It is an amenable number.

122439250981 is a deficient number, since it is larger than the sum of its proper divisors (1).

122439250981 is an equidigital number, since it uses as much as digits as its factorization.

122439250981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 46.

The spelling of 122439250981 in words is "one hundred twenty-two billion, four hundred thirty-nine million, two hundred fifty thousand, nine hundred eighty-one".